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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb479a8806824a9f6a78fa01ba7a5a1407a48d2c784ea6a4690c80844e24012' 
  AND token = 'Q/y8yDJ7l41YEX9bxLXt4m0qixF4xRXJAJEilyBCgVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}